#!/usr/bin/env python
# -*- coding:utf-8 -*-

# 将对文件的增删改查封装到一个类中

class Db:

    def db_read(self):
        pass

    def db_write(self):
        pass

    def db_delete(self):
        pass

    def db_update(self):
        pass


class File:

    def file_read(self):
        pass

    def file_write(self):
        pass

    def file_delete(self):
        pass

    def file_update(self):
        pass

class Redis:

    def redis_read(self):
        pass

    def redis_write(self):
        pass

    def redis_delete(self):
        pass

    def redis_update(self):
        pass